/*
 * Copyright (c) 2015-2029, www.dibo.ltd (service@dibo.ltd).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * <p>
 * https://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.icesoft.framework.core.binding.binder;

import com.icesoft.framework.core.binding.annotation.BindCount;
import com.icesoft.framework.core.binding.binder.remote.RemoteBindingManager;
import com.icesoft.framework.core.binding.cache.BindingCacheManager;
import com.icesoft.framework.core.binding.helper.ResultAssembler;
import com.icesoft.framework.core.config.Cons;
import com.icesoft.framework.core.exception.InvalidUsageException;
import com.icesoft.framework.core.util.BeanUtils;
import com.icesoft.framework.core.util.S;
import com.icesoft.framework.core.util.V;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 关联子项count计数绑定
 */
public class CountBinder<T> extends EntityListBinder<T> {
	private static final Logger log = LoggerFactory.getLogger(CountBinder.class);

	/***
	 * 构造方法
	 * @param annotation
	 * @param voList
	 */
	public CountBinder(BindCount annotation, List voList) {
		super(annotation.entity(), voList);
	}


	@Override
	public void bind() {
		if (V.isEmpty(annoObjectList)) {
			return;
		}
		if (V.isEmpty(refObjJoinCols)) {
			throw new InvalidUsageException("调用错误：无法从condition中解析出字段关联.");
		}
		Map<String, Integer> valueListCountMap;
		if (middleTable == null) {
			this.simplifySelectColumns();
			super.buildQueryWrapperJoinOn();
			// 查询条件为空时不进行查询
			if (queryWrapper.isEmptyOfNormal()) {
				return;
			}
			List<T> entityList = null;
			// 查询entity列表: List<Role>
			if (V.isEmpty(this.module)) {
				// 本地查询获取匹配结果的entityList
				entityList = getEntityList(queryWrapper);
			} else {
				// 远程调用获取
				entityList = RemoteBindingManager.fetchEntityList(module, remoteBindDTO, referencedEntityClass);
			}
			if (V.notEmpty(entityList)) {
				valueListCountMap = this.buildMatchKey2ListCountMap(entityList);
				ResultAssembler.bindPropValue(annoObjectField, super.getMatchedAnnoObjectList(), getAnnoObjJoinFlds(), valueListCountMap, null);
			}
		} else {
			if (refObjJoinCols.size() > 1) {
				throw new InvalidUsageException(NOT_SUPPORT_MSG);
			}
			// 提取注解条件中指定的对应的列表
			Map<String, List> trunkObjCol2ValuesMap = super.buildTrunkObjCol2ValuesMap();
			Map<String, List> middleTableResultMap = middleTable.executeOneToManyQuery(trunkObjCol2ValuesMap);
			if (V.isEmpty(middleTableResultMap)) {
				return;
			}
			valueListCountMap = new HashMap<>();
			for (Map.Entry<String, List> entry : middleTableResultMap.entrySet()) {
				// List<roleId>
				List annoObjFKList = entry.getValue();
				if (V.isEmpty(annoObjFKList)) {
					continue;
				}
				Integer count = entry.getValue() != null ? entry.getValue().size() : 0;
				valueListCountMap.put(entry.getKey(), count);
			}
			// 绑定结果
			ResultAssembler.bindPropValue(annoObjectField, super.getMatchedAnnoObjectList(), getAnnoObjJoinFlds(), valueListCountMap, null);
		}
	}

	/**
	 * 简化select列，仅select主键
	 */
	@Override
	protected void simplifySelectColumns() {
		List<String> selectColumns = new ArrayList<>(8);
		String idCol = BindingCacheManager.getPropInfoByClass(referencedEntityClass).getIdColumn();
		selectColumns.add(idCol);
		selectColumns.addAll(refObjJoinCols);
		String[] selectColsArray = S.toStringArray(selectColumns);
		if (remoteBindDTO != null) {
			remoteBindDTO.setSelectColumns(selectColsArray);
		}
		this.queryWrapper.select(selectColsArray);
	}


	/**
	 * 构建匹配key-count目标的map
	 *
	 * @param list
	 * @return
	 */
	private Map<String, Integer> buildMatchKey2ListCountMap(List<T> list) {
		Map<String, Integer> key2TargetCountMap = new HashMap<>(list.size());
		StringBuilder sb = new StringBuilder();
		for (T entity : list) {
			sb.setLength(0);
			for (int i = 0; i < refObjJoinCols.size(); i++) {
				String refObjJoinOnCol = refObjJoinCols.get(i);
				String pkValue = BeanUtils.getStringProperty(entity, toRefObjField(refObjJoinOnCol));
				if (i > 0) {
					sb.append(Cons.SEPARATOR_COMMA);
				}
				sb.append(pkValue);
			}
			// 查找匹配Key
			String matchKey = sb.toString();
			// 获取list
			Integer entityCount = key2TargetCountMap.get(matchKey);
			if (entityCount == null) {
				entityCount = 0;
			}
			entityCount++;
			key2TargetCountMap.put(matchKey, entityCount);
		}
		sb.setLength(0);
		return key2TargetCountMap;
	}

}